his reputation after the u- s-a today reports armstrong will quote, "admit to doping throughout his career." the newspaper does not name their source, but says its a person with knowledge of the situation. u-s-a today says the former seven-time tour de france champion's admission, which had been widely rumored for weeks, is expected to come in a monday interview with oprah winfrey that will be taped for air thursday. as for why he's doing this now? the journalist who broke the story says armstrong had no choice. >> "with all the evidence that's come out against him it's hard to deny it anymore. and he's making a calculated decision, for himself, personally, and it's also, i think, a business decision for him because it's affecting his charity, livestrong, all of him." armstrong has kept a low profile at his austin home since the u-s anti doping agency released thousands of pages of evidence of what it said was a sophisticated and brazen doping program.